Normal Flora. CLS 212: Medical Microbiology. Relationships b etween Organisms. Symbiosis P ermanent association between two different organisms. Neutralism Two organisms living together, and neither is affected by that. Mutualism T wo organisms living together, and both benefit from that.
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CLS 212: Medical Microbiology
Permanent association between two different organisms.
Two organisms living together, andneither is affected by that.
Two organisms living together, and both benefit from that.
Two organisms living together, one is benefited and the other is not been affected.
Two organisms living together, one is benefited ‘’called parasite’’ and the other is harmed ‘’called host’’.
Sometimes, two (or more) microorganism may work together “team up” to produce a disease that neither could cause by itself.
We all should know about the types and distribution of normal flora in our bodies because:
Why are these microbes temporary??
- Present in the outer layer of skin.
- Staphylococcus epidermidis(accounts 90%) +
- Present in the deeper skin layers, hair follicles, and sweat & sebaceous glands.
- Propionibacterium acnes.
harmless but it might cause
bloodstream infections if skin
primarily S. epidermidis, followed
by S. aureus, C. diphtheroids, and
- Nose and throathave
Many microorganisms. Some
are normal flora, some are
opportunistic, and others are
carried like C. diphtheroids.
- Nasopharynx:Streptococcus pneumoniae
In immune compromised or elderly it might cause acute bacterial pneumonia.
Is usually sterile because the mucous membranes of the lungs remove any microbes.
and anaerobic bacteria.
The most common ones are:
C. diphtheroides, S. aureus,
and S. epidermidis.
protozoa, and viruses can be living in the mouth.
Teeth and Gengiva:S. mutans
Only few bacteria are present in the
stomach due to gastric enzymes and
Only few normal flora are present in
the upper part of small intestine because
bile kills them. Lower parts have more no.
of normal flora.
- Has more bacteria than any other part of the body. 99% of normal flora in the large intestine are anaerobic Bacteroides spp.
- Also many fungi, protozoa, and viruses can live there.
- Many of the normal flora are opportunistic i.e. if they move to other areas e.g.E.colicause urinary infection.